Three in four Seoul residents now drink the city’s tap water, which is sold under the brand name Arisu, and more of them are drinking it away from home, a city survey showed Thursday. In the Seoul Metropolitan Government’s annual survey, 75.5 percent of residents said they drank tap water this year. That was up from 75 percent last year and 69.6 percent in 2024, when the city started using its own measure. The figure adds the 53.9 percent who drink tap water at home to the 21.6 percent who drink it only outside the home. The city created the measure because standards for calculating tap water drinking rates vary by country and institution. Under the American Water Works Association’s criteria, Seoul’s rate was 78.2 percent, 13.2 percentage points above the U.S. figure of 65 percent in 2024. Paris counts people who drink tap water either alone or along with other water. By that method, Seoul’s rate was 82.5 percent, compared with 81 percent for the French capital in 2025. The city said the rise came mainly from more people drinking tap water outdoors. The share of residents who